Based upon my experiences with the SCVMM 2012 management pack in Operations Manager 2012, I added several ReSearch This! KB’s on this topic which are linked below:
Tuning for the System Center 2012 Virtual Machine Manager management pack: (alert name, URL for the ReSearch This KB)
VGS Not installed: http://www.systemcentercentral.com/BlogDetails/tabid/143/indexId/93620/Default.aspx
Host has exceeded the supported maximum number of running VMs: http://www.systemcentercentral.com/BlogDetails/tabid/143/indexId/93621/Default.aspx
Host Memory Utilization is high: http://www.systemcentercentral.com/BlogDetails/tabid/143/indexId/93622/Default.aspx
OM Agent Proxy not enabled: http://www.systemcentercentral.com/BlogDetails/tabid/143/indexId/93623/Default.aspx